I am new to this thing but I didn't think you were able to / recommended to walk on the roof? Isn't it like 1/4" plywood over 1x2 or something else pretty flimsy? I guess I'll have to check that link, but I'm at work

Roofs are a truss system. I don't know of a roof you can't walk on. Besides, in order to satisfy warranty, how else are you going to inspect, reseal etc the roof? We've walked on every one we've owned. Sure, they flex a little, but you're not going to fall through it. If you ever get to see any brand RV built, you won't hesitate walking on one. They may have 2-3 plus guys stomping around up there installing stuff.

I am new to this thing but I didn't think you were able to / recommended to walk on the roof? Isn't it like 1/4" plywood over 1x2 or something else pretty flimsy? I guess I'll have to check that link, but I'm at work

Most manufacturers don't recommend walking on the roof. They are pretty flimsy. Jayco, on the other hand, takes pride in the strength of its roof trusses and the decking they use that is stronger and more durable than the manufacturers. I've been on the roof of my Nash... but I don't walk around. I sit and scoot or crawl across it. I would have MUCH greater confidence walking on my future Jayco.

If you can walk on the roof, the manufacturer will gladly use that as a selling point.
I have owned a good many tt's, MH's and fifth wheels. Some of the earlier ones and one less than 10 years old could not be walked on without causing damage. Newer models not so much.
I would not assume or walk on one without checking the manufacturers specs.